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View Full Version : [Important] Chemistry test... Need answers.


Laur€ns
06-04-2009, 10:24 PM
So, I got some chemistry test about reactions and stuff which I could get my hands on. Now, I need some halp with the answers... Here are the questions (some are multiplechoice)

Edit: Removed the ones I have.

12. The fertilizer used in agriculture is a mixture of substances. One of these substances is ammonium nitrate (NH4NO3). Someone heats an amount of this substance. Because of this reaction, the ammonium nitrate is conversed into two other substances: water and the gas di-nitrogen-mono-oxide.
c) How much grammes of ammonium nitrate have been conversed during combustion? Explain your answer(!).
e) = BONUS Give the mass ratio of this reaction using the following data:
Mass of one atom:: Hydrogen = 1,0u Nitrogen = 14,0u Oxygen = 16,0u.
Check if this is the same as the given ratio for water and di-nitrogen-mono-oxide (1,0:1,2).


Thanks in advance.
-Laurens.
bobng
06-04-2009, 11:15 PM
1) B
2) B
3) (A or B)
4) Not sure, I dont think any of them are. Proberbly C
5) B

10) Mixture - involves dissolving and dissolving is not technically a chemical reaction
11) CBA
12) CBA
Naum
06-04-2009, 11:20 PM
Number 4) Burning :)

All the others a physical.
Torrent of Flame
06-05-2009, 01:22 AM
8)d) Are iron and rust pure substances? Explain.

Iron is a pure substance, as it just contains Iron atoms, but rust is where the Iron comes into contact with air in the presence of water or air moisture, forming iron oxide, so rust is a mixture of iron and oxygen, so rust != pure, but iron == pure.
tarajunky
06-05-2009, 01:37 AM
1.c
2.a
3.d
4.b
5.b
Nadeem
06-05-2009, 02:53 AM
Trust tarajunky, he's a doctor :O



~NS
Laur€ns
06-05-2009, 03:43 AM
Okay, I will trust tarajunky then :)
I have everything except 12C and 12E now...
Laur€ns
06-05-2009, 10:55 PM
Bumpy :o
tarajunky
06-06-2009, 04:28 AM
It looks like you need more information to answer those questions.

Post the rest of that question in case it mentions something important.
P1nky
06-06-2009, 04:33 AM
It looks like you need more information to answer those questions.

Post the rest of that question in case it mentions something important.

lol yeah dude, Tara=DR so ask him! lol.

Btw why don't you google it? i always do that and ends up helping me :)
Laur€ns
06-11-2009, 09:48 PM
Okay, I did the test, even with these answers I scored 63%.. I guess the teacher hates me, since he doesn´t want to give the test back..
bobng
06-28-2009, 07:14 PM
lol. Should have used my answers.